compiler: Enhance _alloc_object_on_low_lat_mem

Author: FabioLuporini

devito/passes/iet/definitions.py

@@ -101,6 +101,10 @@ def _alloc_object_on_low_lat_mem(self, site, obj, storage):
         if not init:
             definition = decl
             efuncs = ()
+        elif isinstance(init, (list, tuple)):
+            assert len(init) == 2, "Expected (efunc, call)"
+            init, definition = init
+            efuncs = (init,)
         elif init.is_Callable:
             definition = Call(init.name, init.parameters,
                               retobj=obj if init.retval else None)